When Kyle's sister Kim Richards, who checked in to rehab in 2012, showed up to a poker party acting like she might be under the influence, Kyle panicked that her older sister had fallen off the wagon.

Though Kim, 50, privately admitted to Kyle, 46, that she had "taken something" for pain, Kim walked away from her sister to find a sympathetic ear in Glanville, and the resulting clash between sister and friend turned violent.

"This yacht is gorgeous," said an excited Richards, who went to Mallorca, Spain, with her husband and two of her daughters. "I can't believe we're going to float around on this for one week in the Mediterranean."

When Foster joined Richards, the two toured Spain, went tubing – the Dutch model referred to hers as a "bagel" – and jumped off the side of the yacht, before she received a call from her husband, music producer David Foster, informing her that her 17-year-old daughter, Bella Hadid, had been arrested.

"The first time I met Eileen was in the late '80s … Eileen was huge on The Young and The Restless," said Rinna, referencing Davidson's role as Ashley Abbott, before the two worked together on Days – Davidson as the villainous Kristen DiMera and Rinna as Billie Reed.

"At this point in my life and career, I feel incredibly grateful," Davidson said about her 2014 Daytime Emmy win for best actress on Days. "I've been doing this for so long … it might never happen again for me."

"We're still filming. We're right in the thick of it," Kyle Richards tells PEOPLE about Season 5 of the reality show. "I think it's going to be a very exciting season. There's some new people on the show that we already have existing relationships with."

Although Richards, 45, remains tight-lipped about who is joining the Housewives cast, she says not everyone is getting along.

Before The Real Housewives of Beverly Hills stroll into the setting sun on Rodeo Drive until next season, there was time for a few more diamond-studded fights on the reunion finale.

Life certainly wasn't all diamonds and rosé for Lisa Vanderpump, whose fractured friendships were front and center all season, and who felt ganged-up on during the reunion.

Leading the attack was Kyle Richards, who once compared Vanderpump to chess player Bobby Fischer due to all her strategizing and who was still miffed at Vanderpump for bringing up the tabloid cheating rumors about her husband.